Radioreceiver



July 27, 1926. 1,593,963

W. M. BRUCE, JR

-RAD-I ORECEIVER Filed Jan. a1, 1925 2 She e-ts-Srieeg 1 anon H207 July 27', 1926.

- fw? M. BRUCE, JR

RA IoREcE IvER Filed Jan. 31-

1925 I 2 Sheets-Sheet 2 a a l I I I I 1 VII/Ill? u I I n w h I l a n I w Patented July 27, 1926.

WILLIAM M. BRUCE, JR... 015 SPRINGFIELD, OHIO.

namonnonivnn' Application filed January 31.1925. Serial No. 6,072.

My invention relates to improvements in devices for radio reception and has for its object the softening and reduction of out side disturbances and the lessening of distortion in the reception of broadcasting by radio and also the simplification of the construction of the mechanism involved.

The device is adapted for reception of the usual broadcasting-of speech and music as well as for telegraphic signals.

The invention consists of constructions and combinations hereinafter set forth and more particularly pointed out in the claims.

As generally used the device embodies both a loud speaker and headsets, the use of the ordinary telephone head sets being dispensed with. ,For telegraphic reception the loud speaker consisting of the sound magnifying'device such as a horn may be dispensed with and the head pieces only employed. 1

In the accompanying.draw1ngs:

Fig. 1 is a side. elevation of the device the sound magnifying horn of the usua type 'not being shown;

Fig. 2 is a plan view' of the interior construction looking into the base of the device. Fig. 3 is asectional elevation of the same.

3 is a detail showing one of the spring valves in open position.

Fig. 4 is a detail of a valve mechanism for controlling the horn or loud speaker.

Figs. 5, 6- and 8 are detail views of similar parts hereinafter referred to.

Fig. 7 is a sectional elevation of the operating parts showing amodification especially adapted for telegraphic reception.

- Like parts are represented by similar letters of reference in the several views.

In the drawings, .arepresents a base of. 7 general cylindrical form and b the outside framework or cover which is secured to the base preferably by means of screws 6 which engage in lugs a on the base. The upper part of this cover 5 is provided with an extension 6 into which the magnifying device or born c is inserted. In the extended portion b is a valve arrangement by which the opening to the born 0 can be closed so as to cut out the. loud speaking device when de-- sired. This valve arrangement is shown in detail in Figs. 4 and 5 and consists preferably of a disk of rubber or similar material 0 adapted to rest upon a seat 0 and to be moved to or from said seat 0 by a valve operating stemc which extends to the outside of the extended portion 7) andis provided with a'cam or wrist c engaginga link 0 (Figs. 4 and 5) which connects to the disk or valve proper a so that as the stem is raised the disk will be moved to or from. the

seat 0 and thus open or close the passage to I the horn 0. The telephonic receiving device embodies a casing or sound box at preferably of two parts (Z and d", the part d being of a recessed cylindrical shape and internally threaded to receive thepart d which is externally threaded to fit into the part at. Between these parts is a telephone diaphragme preferably of mica. It is inserted and held firmly between the parts dand d with some dampening and cushioning mate"- rial, rings orwashers of ordinary blotting paper being well adapted forthis purpose. This sound box including the diaphragm is mounted upon a horseshoe magnet f to which it is directly attached by fastening devices preferably screws f (Fig; 2), these fastening devices and intermediate washers or supportsbein of brass or other nonsuch that a comparatively large magnet is secured and it also furnishes the support for the sound box.

Secured to' the sound box at one side is an arm 9 of a general Z -shape,'one end being secured to the sound box and the other end having anelongated part g and abutthe arm g, the end of the reed resting against the abutment 9 The screw h passes through the part g of the arm 9 and also into the reed it so that means for adjusting the reed is secured and for holding it firmly in position by clamping the reed against the abutment g and that formed by the screw 71. by the'use of the-clamping screw h.

connection j and this'link connection is made I of'a peculiar form which in connection with the vibrating reed serves to eliminate a certain amount of distortion and reducethe.

static influences. It. consists of a wire-j bent upon itself to form a cushioning coil 3' and connected at' one end, to the (Fig. 6 v reed h and at the other end to the diaphragm.

magnetic materia, the arrangement bein'g The other or free end of the reed h is connected to the diaphragm by a link of rubber. j which may be in the nature of.

rubber leaves sliped over the wire to prevent contact of the sides of the coil and also to serve to dampen any vibrations of the coil Secured to the magnet 7 preferably by the same fastening devices f which secure the magnet. to the sound box are the electro-magnets or coils 7: (Figs. 3 and 7) and electrical connections are made from the conductor cord Z in a suitable manner. The pole pieces of the coils or magnets c are arranged opposite the vibrating reed it so that the magnetic vibrations in the magnets or coils are transmitted directly to the vibrating part or reed h and through this transmitted to the diaphragm.

By this construction described telephonic receiving mechanism is embodied in a single unit of which the magnet forms the supporting frame and the parts can be assembled in units and afterwards placed in any suitable form of enclosingcasing depending upon the 'use to which the instrument is to be put. l Vhen used in connection with a loud speaker the parts will be preferably assembled as indicated in Figs. 2 and 3 by attaching the magnet and the connected and supported parts to the base of the instrument and for this purpose the base a! may be formed with a cross bar a 'pierced to receive suitable attaching screws a which pass through the cross bar and into the magnet, these fastening devices being of brass or other suitable material to prevent a magnetic connection.

Leading from the sound box and on opposite sides of the diaphragm are openings on and m The opening m leads directly into the loud speaking device or horn and the .opening m extends down between the prongs of the magnet and is connected by a suitable tube m to a tube or connector m exin Fig. 3 comprising a spring pressed ball' m which normally closes the respective openings. For ear reception connectors may be inserted into one or more of the respective branches and these are preferably made in the form of a slip connection m which will fit into the outer opening of a branch and project in against the valve and open the same. These hollow slip connections are preferably slotted at the vend as shown in Fig. 3** so that the sound passing from the sound box through its connection can pass through the openings while the end of the tube might be closed or partially closed by the ball valve. Sufficient play is permitted ing of speech or music.

around the balls forming the valves to permit the sound to pass through when the same are moved inwardly away from the seats against which they are normally held. The head piece may be simply tubes m inserted into the ears of the operator or they may be of any desired type to which flexible connections such as rubber tubes are made to convey the sound over an air cushion to the ears of' the operator.

For broadcasting reception of speech, music, etc. the reed it will be tuned to a fre quency which will respond to the vibrations comprising the range of ordinary broadcast- When telegraphic reception is desired, however, particularly for continuous wave transmission I formthevibrator 71, in the form of a tuning fork as shown in Fig. 7 and this fork is tuned to a desired frequency corresponding to the note which is desired for the aural reception. 1 also in this case preferably bring the diaphragm to a resonance corresponding to the frequency of the tuning fork and this with then telegraphic signals of a continuous wave form which are brought in by the usual hetrodyning effect with a beat note of 800 will be readily received upon a device of this character. and other signals or dis 'turbing influences having a different frequency will not affect the movement of the fork and those signals having the frequency of the vibrating fork alone will be reproduced. V

For telegraphic purposes it is obvious that the loud speaking device may be eliminated and the ear piece can be connected to either side of the diaphragm or one of the openings may be dispensed with.

Having thus. described my invention, I claim: y

1. In a telephonic receiving device, a supporting base having conduit openings therein, a telephonic receiving device consisting of a magnet, a sound box, coils and armature mounted as a unitary structure and sup ported in, said base, chambers in said sound box on opposite sides of the diaphragm, and a connection from one of said chambers to the conduits in the base and from the other chamber to a loud speaking device as set forth.

2. In a radio receiving device, a sound box, a magnet,.a' diaphragm, a vibrating armature connected to said diaphragm, and coils on said magnet as a unitary structure,

an outer casing having a base and an enclosing 'cover, chambers on opposite sides of said diaphragm leading from said sound box, one at least of said chambers being connected by a conduit through the base and by another conduit extending through the upper portion of the casing to a horn and valve connections in the respective conduits by which either or both of said conduits may be closed.

3., In a radio receiving device, a telephonic instrument consisting of a sound box, a diaphragm, magnet and coils mounted as a unita structure and supported on a suitable b ase, a conduit, leading from one side of said diaphragm and connected with a plurality of openings in the base and automatic valves in said openin s, and detachable conduits adapted to b inserted'in said conduit openings and open the valves when the same are inserted.

4. In a telephonic receiving device, I a sound box having a diaphragm, a conduit leading from one side of said sound box to a conduit in the base in which said device is able fastening devices and abutment as described, a connection from said vibrating armature to said diaphragm, a magnet having coils adj acent to said armature, and supporting said sound box whereby an adjustable unitary structure is formed, the parts of which are supported on said magnet.

6. In a radio receiving device, a supporting casing, 'a sound box sup orted therein, a

diaphragm in said box, said box having a chamber on each side of said diaphragm, a

I conduit leading from each chamber a sound '7. In a radio receiving device, a support ing base, audio receiving mechanism carried by said base, amplifying devices operated thereby and supported by said base, manually operated means for connecting and disconnecting said amplifying device with or from said mechanism, a sound box asso ciated with said mechanism, a conduit leading from said box to a point on said base and at least one ear reception member con nected with said conduit.

8. In a device of the character described, a permanent magnet, coils, armature and sound box all connected together as a unit, a supporting base and casing for en porting and enclosing said unit, said base-having a connector for ear reception devices, a conduit leading from said sound box to said connector, a sound amplifying device carri'ed. by said base, means for establishing communication between said sound box and said sound amplifying device, and means my hand this 27th day of January'1925.

WILLIAM M. BRUCE, JR. 

